diff options
Diffstat (limited to 'sound/soc/img/img-i2s-in.c')
| -rw-r--r-- | sound/soc/img/img-i2s-in.c | 516 |
1 files changed, 516 insertions, 0 deletions
diff --git a/sound/soc/img/img-i2s-in.c b/sound/soc/img/img-i2s-in.c new file mode 100644 index 000000000..0389203f8 --- /dev/null +++ b/sound/soc/img/img-i2s-in.c @@ -0,0 +1,516 @@ +/* + * IMG I2S input controller driver + * + * Copyright (C) 2015 Imagination Technologies Ltd. + * + * Author: Damien Horsley <Damien.Horsley@imgtec.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + */ + +#include <linux/clk.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/reset.h> + +#include <sound/core.h> +#include <sound/dmaengine_pcm.h> +#include <sound/initval.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include <sound/soc.h> + +#define IMG_I2S_IN_RX_FIFO 0x0 + +#define IMG_I2S_IN_CTL 0x4 +#define IMG_I2S_IN_CTL_ACTIVE_CHAN_MASK 0xfffffffc +#define IMG_I2S_IN_CTL_ACTIVE_CH_SHIFT 2 +#define IMG_I2S_IN_CTL_16PACK_MASK BIT(1) +#define IMG_I2S_IN_CTL_ME_MASK BIT(0) + +#define IMG_I2S_IN_CH_CTL 0x4 +#define IMG_I2S_IN_CH_CTL_CCDEL_MASK 0x38000 +#define IMG_I2S_IN_CH_CTL_CCDEL_SHIFT 15 +#define IMG_I2S_IN_CH_CTL_FEN_MASK BIT(14) +#define IMG_I2S_IN_CH_CTL_FMODE_MASK BIT(13) +#define IMG_I2S_IN_CH_CTL_16PACK_MASK BIT(12) +#define IMG_I2S_IN_CH_CTL_JUST_MASK BIT(10) +#define IMG_I2S_IN_CH_CTL_PACKH_MASK BIT(9) +#define IMG_I2S_IN_CH_CTL_CLK_TRANS_MASK BIT(8) +#define IMG_I2S_IN_CH_CTL_BLKP_MASK BIT(7) +#define IMG_I2S_IN_CH_CTL_FIFO_FLUSH_MASK BIT(6) +#define IMG_I2S_IN_CH_CTL_LRD_MASK BIT(3) +#define IMG_I2S_IN_CH_CTL_FW_MASK BIT(2) +#define IMG_I2S_IN_CH_CTL_SW_MASK BIT(1) +#define IMG_I2S_IN_CH_CTL_ME_MASK BIT(0) + +#define IMG_I2S_IN_CH_STRIDE 0x20 + +struct img_i2s_in { + void __iomem *base; + struct clk *clk_sys; + struct snd_dmaengine_dai_dma_data dma_data; + struct device *dev; + unsigned int max_i2s_chan; + void __iomem *channel_base; + unsigned int active_channels; + struct snd_soc_dai_driver dai_driver; +}; + +static inline void img_i2s_in_writel(struct img_i2s_in *i2s, u32 val, u32 reg) +{ + writel(val, i2s->base + reg); +} + +static inline u32 img_i2s_in_readl(struct img_i2s_in *i2s, u32 reg) +{ + return readl(i2s->base + reg); +} + +static inline void img_i2s_in_ch_writel(struct img_i2s_in *i2s, u32 chan, + u32 val, u32 reg) +{ + writel(val, i2s->channel_base + (chan * IMG_I2S_IN_CH_STRIDE) + reg); +} + +static inline u32 img_i2s_in_ch_readl(struct img_i2s_in *i2s, u32 chan, + u32 reg) +{ + return readl(i2s->channel_base + (chan * IMG_I2S_IN_CH_STRIDE) + reg); +} + +static inline void img_i2s_in_ch_disable(struct img_i2s_in *i2s, u32 chan) +{ + u32 reg; + + reg = img_i2s_in_ch_readl(i2s, chan, IMG_I2S_IN_CH_CTL); + reg &= ~IMG_I2S_IN_CH_CTL_ME_MASK; + img_i2s_in_ch_writel(i2s, chan, reg, IMG_I2S_IN_CH_CTL); +} + +static inline void img_i2s_in_ch_enable(struct img_i2s_in *i2s, u32 chan) +{ + u32 reg; + + reg = img_i2s_in_ch_readl(i2s, chan, IMG_I2S_IN_CH_CTL); + reg |= IMG_I2S_IN_CH_CTL_ME_MASK; + img_i2s_in_ch_writel(i2s, chan, reg, IMG_I2S_IN_CH_CTL); +} + +static inline void img_i2s_in_disable(struct img_i2s_in *i2s) +{ + u32 reg; + + reg = img_i2s_in_readl(i2s, IMG_I2S_IN_CTL); + reg &= ~IMG_I2S_IN_CTL_ME_MASK; + img_i2s_in_writel(i2s, reg, IMG_I2S_IN_CTL); +} + +static inline void img_i2s_in_enable(struct img_i2s_in *i2s) +{ + u32 reg; + + reg = img_i2s_in_readl(i2s, IMG_I2S_IN_CTL); + reg |= IMG_I2S_IN_CTL_ME_MASK; + img_i2s_in_writel(i2s, reg, IMG_I2S_IN_CTL); +} + +static inline void img_i2s_in_flush(struct img_i2s_in *i2s) +{ + int i; + u32 reg; + + for (i = 0; i < i2s->active_channels; i++) { + reg = img_i2s_in_ch_readl(i2s, i, IMG_I2S_IN_CH_CTL); + reg |= IMG_I2S_IN_CH_CTL_FIFO_FLUSH_MASK; + img_i2s_in_ch_writel(i2s, i, reg, IMG_I2S_IN_CH_CTL); + reg &= ~IMG_I2S_IN_CH_CTL_FIFO_FLUSH_MASK; + img_i2s_in_ch_writel(i2s, i, reg, IMG_I2S_IN_CH_CTL); + } +} + +static int img_i2s_in_trigger(struct snd_pcm_substream *substream, int cmd, + struct snd_soc_dai *dai) +{ + struct img_i2s_in *i2s = snd_soc_dai_get_drvdata(dai); + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + case SNDRV_PCM_TRIGGER_RESUME: + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: + img_i2s_in_enable(i2s); + break; + + case SNDRV_PCM_TRIGGER_STOP: + case SNDRV_PCM_TRIGGER_SUSPEND: + case SNDRV_PCM_TRIGGER_PAUSE_PUSH: + img_i2s_in_disable(i2s); + break; + default: + return -EINVAL; + } + + return 0; +} + +static int img_i2s_in_check_rate(struct img_i2s_in *i2s, + unsigned int sample_rate, unsigned int frame_size, + unsigned int *bclk_filter_enable, + unsigned int *bclk_filter_value) +{ + unsigned int bclk_freq, cur_freq; + + bclk_freq = sample_rate * frame_size; + + cur_freq = clk_get_rate(i2s->clk_sys); + + if (cur_freq >= bclk_freq * 8) { + *bclk_filter_enable = 1; + *bclk_filter_value = 0; + } else if (cur_freq >= bclk_freq * 7) { + *bclk_filter_enable = 1; + *bclk_filter_value = 1; + } else if (cur_freq >= bclk_freq * 6) { + *bclk_filter_enable = 0; + *bclk_filter_value = 0; + } else { + dev_err(i2s->dev, + "Sys clock rate %u insufficient for sample rate %u\n", + cur_freq, sample_rate); + return -EINVAL; + } + + return 0; +} + +static int img_i2s_in_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params, struct snd_soc_dai *dai) +{ + struct img_i2s_in *i2s = snd_soc_dai_get_drvdata(dai); + unsigned int rate, channels, i2s_channels, frame_size; + unsigned int bclk_filter_enable, bclk_filter_value; + int i, ret = 0; + u32 reg, control_mask, chan_control_mask; + u32 control_set = 0, chan_control_set = 0; + snd_pcm_format_t format; + + rate = params_rate(params); + format = params_format(params); + channels = params_channels(params); + i2s_channels = channels / 2; + + switch (format) { + case SNDRV_PCM_FORMAT_S32_LE: + frame_size = 64; + chan_control_set |= IMG_I2S_IN_CH_CTL_SW_MASK; + chan_control_set |= IMG_I2S_IN_CH_CTL_FW_MASK; + chan_control_set |= IMG_I2S_IN_CH_CTL_PACKH_MASK; + break; + case SNDRV_PCM_FORMAT_S24_LE: + frame_size = 64; + chan_control_set |= IMG_I2S_IN_CH_CTL_SW_MASK; + chan_control_set |= IMG_I2S_IN_CH_CTL_FW_MASK; + break; + case SNDRV_PCM_FORMAT_S16_LE: + frame_size = 32; + control_set |= IMG_I2S_IN_CTL_16PACK_MASK; + chan_control_set |= IMG_I2S_IN_CH_CTL_16PACK_MASK; + break; + default: + return -EINVAL; + } + + if ((channels < 2) || + (channels > (i2s->max_i2s_chan * 2)) || + (channels % 2)) + return -EINVAL; + + control_set |= ((i2s_channels - 1) << IMG_I2S_IN_CTL_ACTIVE_CH_SHIFT); + + ret = img_i2s_in_check_rate(i2s, rate, frame_size, + &bclk_filter_enable, &bclk_filter_value); + if (ret < 0) + return ret; + + if (bclk_filter_enable) + chan_control_set |= IMG_I2S_IN_CH_CTL_FEN_MASK; + + if (bclk_filter_value) + chan_control_set |= IMG_I2S_IN_CH_CTL_FMODE_MASK; + + control_mask = IMG_I2S_IN_CTL_16PACK_MASK | + IMG_I2S_IN_CTL_ACTIVE_CHAN_MASK; + + chan_control_mask = IMG_I2S_IN_CH_CTL_16PACK_MASK | + IMG_I2S_IN_CH_CTL_FEN_MASK | + IMG_I2S_IN_CH_CTL_FMODE_MASK | + IMG_I2S_IN_CH_CTL_SW_MASK | + IMG_I2S_IN_CH_CTL_FW_MASK | + IMG_I2S_IN_CH_CTL_PACKH_MASK; + + reg = img_i2s_in_readl(i2s, IMG_I2S_IN_CTL); + reg = (reg & ~control_mask) | control_set; + img_i2s_in_writel(i2s, reg, IMG_I2S_IN_CTL); + + for (i = 0; i < i2s->active_channels; i++) + img_i2s_in_ch_disable(i2s, i); + + for (i = 0; i < i2s->max_i2s_chan; i++) { + reg = img_i2s_in_ch_readl(i2s, i, IMG_I2S_IN_CH_CTL); + reg = (reg & ~chan_control_mask) | chan_control_set; + img_i2s_in_ch_writel(i2s, i, reg, IMG_I2S_IN_CH_CTL); + } + + i2s->active_channels = i2s_channels; + + img_i2s_in_flush(i2s); + + for (i = 0; i < i2s->active_channels; i++) + img_i2s_in_ch_enable(i2s, i); + + return 0; +} + +static int img_i2s_in_set_fmt(struct snd_soc_dai *dai, unsigned int fmt) +{ + struct img_i2s_in *i2s = snd_soc_dai_get_drvdata(dai); + int i; + u32 chan_control_mask, lrd_set = 0, blkp_set = 0, chan_control_set = 0; + u32 reg; + + switch (fmt & SND_SOC_DAIFMT_INV_MASK) { + case SND_SOC_DAIFMT_NB_NF: + lrd_set |= IMG_I2S_IN_CH_CTL_LRD_MASK; + break; + case SND_SOC_DAIFMT_NB_IF: + break; + case SND_SOC_DAIFMT_IB_NF: + lrd_set |= IMG_I2S_IN_CH_CTL_LRD_MASK; + blkp_set |= IMG_I2S_IN_CH_CTL_BLKP_MASK; + break; + case SND_SOC_DAIFMT_IB_IF: + blkp_set |= IMG_I2S_IN_CH_CTL_BLKP_MASK; + break; + default: + return -EINVAL; + } + + switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { + case SND_SOC_DAIFMT_I2S: + chan_control_set |= IMG_I2S_IN_CH_CTL_CLK_TRANS_MASK; + break; + case SND_SOC_DAIFMT_LEFT_J: + break; + default: + return -EINVAL; + } + + switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { + case SND_SOC_DAIFMT_CBM_CFM: + break; + default: + return -EINVAL; + } + + chan_control_mask = IMG_I2S_IN_CH_CTL_CLK_TRANS_MASK; + + for (i = 0; i < i2s->active_channels; i++) + img_i2s_in_ch_disable(i2s, i); + + /* + * BLKP and LRD must be set during separate register writes + */ + for (i = 0; i < i2s->max_i2s_chan; i++) { + reg = img_i2s_in_ch_readl(i2s, i, IMG_I2S_IN_CH_CTL); + reg = (reg & ~chan_control_mask) | chan_control_set; + img_i2s_in_ch_writel(i2s, i, reg, IMG_I2S_IN_CH_CTL); + reg = (reg & ~IMG_I2S_IN_CH_CTL_BLKP_MASK) | blkp_set; + img_i2s_in_ch_writel(i2s, i, reg, IMG_I2S_IN_CH_CTL); + reg = (reg & ~IMG_I2S_IN_CH_CTL_LRD_MASK) | lrd_set; + img_i2s_in_ch_writel(i2s, i, reg, IMG_I2S_IN_CH_CTL); + } + + for (i = 0; i < i2s->active_channels; i++) + img_i2s_in_ch_enable(i2s, i); + + return 0; +} + +static const struct snd_soc_dai_ops img_i2s_in_dai_ops = { + .trigger = img_i2s_in_trigger, + .hw_params = img_i2s_in_hw_params, + .set_fmt = img_i2s_in_set_fmt +}; + +static int img_i2s_in_dai_probe(struct snd_soc_dai *dai) +{ + struct img_i2s_in *i2s = snd_soc_dai_get_drvdata(dai); + + snd_soc_dai_init_dma_data(dai, NULL, &i2s->dma_data); + + return 0; +} + +static const struct snd_soc_component_driver img_i2s_in_component = { + .name = "img-i2s-in" +}; + +static int img_i2s_in_dma_prepare_slave_config(struct snd_pcm_substream *st, + struct snd_pcm_hw_params *params, struct dma_slave_config *sc) +{ + unsigned int i2s_channels = params_channels(params) / 2; + struct snd_soc_pcm_runtime *rtd = st->private_data; + struct snd_dmaengine_dai_dma_data *dma_data; + int ret; + + dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, st); + + ret = snd_hwparams_to_dma_slave_config(st, params, sc); + if (ret) + return ret; + + sc->src_addr = dma_data->addr; + sc->src_addr_width = dma_data->addr_width; + sc->src_maxburst = 4 * i2s_channels; + + return 0; +} + +static const struct snd_dmaengine_pcm_config img_i2s_in_dma_config = { + .prepare_slave_config = img_i2s_in_dma_prepare_slave_config +}; + +static int img_i2s_in_probe(struct platform_device *pdev) +{ + struct img_i2s_in *i2s; + struct resource *res; + void __iomem *base; + int ret, i; + struct reset_control *rst; + unsigned int max_i2s_chan_pow_2; + struct device *dev = &pdev->dev; + + i2s = devm_kzalloc(dev, sizeof(*i2s), GFP_KERNEL); + if (!i2s) + return -ENOMEM; + + platform_set_drvdata(pdev, i2s); + + i2s->dev = dev; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + base = devm_ioremap_resource(dev, res); + if (IS_ERR(base)) + return PTR_ERR(base); + + i2s->base = base; + + if (of_property_read_u32(pdev->dev.of_node, "img,i2s-channels", + &i2s->max_i2s_chan)) { + dev_err(dev, "No img,i2s-channels property\n"); + return -EINVAL; + } + + max_i2s_chan_pow_2 = 1 << get_count_order(i2s->max_i2s_chan); + + i2s->channel_base = base + (max_i2s_chan_pow_2 * 0x20); + + i2s->clk_sys = devm_clk_get(dev, "sys"); + if (IS_ERR(i2s->clk_sys)) { + if (PTR_ERR(i2s->clk_sys) != -EPROBE_DEFER) + dev_err(dev, "Failed to acquire clock 'sys'\n"); + return PTR_ERR(i2s->clk_sys); + } + + ret = clk_prepare_enable(i2s->clk_sys); + if (ret) + return ret; + + i2s->active_channels = 1; + i2s->dma_data.addr = res->start + IMG_I2S_IN_RX_FIFO; + i2s->dma_data.addr_width = 4; + + i2s->dai_driver.probe = img_i2s_in_dai_probe; + i2s->dai_driver.capture.channels_min = 2; + i2s->dai_driver.capture.channels_max = i2s->max_i2s_chan * 2; + i2s->dai_driver.capture.rates = SNDRV_PCM_RATE_8000_192000; + i2s->dai_driver.capture.formats = SNDRV_PCM_FMTBIT_S32_LE | + SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S16_LE; + i2s->dai_driver.ops = &img_i2s_in_dai_ops; + + rst = devm_reset_control_get(dev, "rst"); + if (IS_ERR(rst)) { + if (PTR_ERR(rst) == -EPROBE_DEFER) { + ret = -EPROBE_DEFER; + goto err_clk_disable; + } + + dev_dbg(dev, "No top level reset found\n"); + + img_i2s_in_disable(i2s); + + for (i = 0; i < i2s->max_i2s_chan; i++) + img_i2s_in_ch_disable(i2s, i); + } else { + reset_control_assert(rst); + reset_control_deassert(rst); + } + + img_i2s_in_writel(i2s, 0, IMG_I2S_IN_CTL); + + for (i = 0; i < i2s->max_i2s_chan; i++) + img_i2s_in_ch_writel(i2s, i, + (4 << IMG_I2S_IN_CH_CTL_CCDEL_SHIFT) | + IMG_I2S_IN_CH_CTL_JUST_MASK | + IMG_I2S_IN_CH_CTL_FW_MASK, IMG_I2S_IN_CH_CTL); + + ret = devm_snd_soc_register_component(dev, &img_i2s_in_component, + &i2s->dai_driver, 1); + if (ret) + goto err_clk_disable; + + ret = devm_snd_dmaengine_pcm_register(dev, &img_i2s_in_dma_config, 0); + if (ret) + goto err_clk_disable; + + return 0; + +err_clk_disable: + clk_disable_unprepare(i2s->clk_sys); + + return ret; +} + +static int img_i2s_in_dev_remove(struct platform_device *pdev) +{ + struct img_i2s_in *i2s = platform_get_drvdata(pdev); + + clk_disable_unprepare(i2s->clk_sys); + + return 0; +} + +static const struct of_device_id img_i2s_in_of_match[] = { + { .compatible = "img,i2s-in" }, + {} +}; +MODULE_DEVICE_TABLE(of, img_i2s_in_of_match); + +static struct platform_driver img_i2s_in_driver = { + .driver = { + .name = "img-i2s-in", + .of_match_table = img_i2s_in_of_match + }, + .probe = img_i2s_in_probe, + .remove = img_i2s_in_dev_remove +}; +module_platform_driver(img_i2s_in_driver); + +MODULE_AUTHOR("Damien Horsley <Damien.Horsley@imgtec.com>"); +MODULE_DESCRIPTION("IMG I2S Input Driver"); +MODULE_LICENSE("GPL v2"); |